I would perform a tune-up for the Oscillator Card. You'll need to plug in your General Electric LX Handset in order to gain access to the Function Values and be able to calibrate values.
Before you plug in, you need the Crown service manual and go to the pages that show the charts for Function Values. Start with all of this first, let me know how your doing.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.